MongooseJS 4.6.1 发布了， MongooseJS是基于nodejs，使用javascript编程，连接mongodb数据库的软件包，使mongodb的文档数据模型变的优雅起来，方便对mongodb文档型数据库的连接和增删改查等常规数据操作。
改进日志：
fix(query): improve handling of $not with $elemMatch #4531 #3719 [timbowhite]
fix: upgrade mongodb -> 2.2.10 #4517
chore: fix webpack build issue #4512 [saiichihashimoto]
fix(query): emit error on next tick when exec callback errors #4500
test: improve test case #4496 [isayme]
fix(schema): use same check for array types and top-level types #4493
: fix indentation in docs #4489 [dhurlburtusa]
fix(schema): expose original object passed to constructor #4486
fix(query): handle findOneAndUpdate with array of arrays #4484 #4470 [fedotov]
feat(document): add $ignore to make a path ignored #4480
fix(query): properly handle setting single embedded in update #4475 #4466 #4465
fix(updateValidators): handle single nested schema subpaths correctly #4479
fix(model): throw handy error when method name conflicts with property name #4475
fix(schema): handle .set() with array field #4472
fix(query): check nested path when avoiding double-validating Mixed #4441
fix(schema): handle calling path.trim() with no args correctly #4042
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